The best free ACT apps are official or ACT-specific drills you can finish on a phone. SAT apps, unlabeled "36 in a week" games, and AI full tests are not a substitute. Use apps for 10–15 questions. Save official timed sections for a laptop or paper.
What to look for
- Enhanced counts and clocks, not 75-question English
- Explanations, not only a green check
- Works offline on the bus
- No paywall after one quiz if they advertised "free"
A sane free stack
Official ACT sample questions on a browser. thirty-six Basic for concept quizzes (one free quiz per concept, English and Math lessons, a timer). Then official full tests on a weekend. Free ACT practice tests, 20-minute sessions.
What to skip
- Bluebook SAT practice scored as if it were the ACT
- ChatGPT "full ACTs" with no scale. ChatGPT and the ACT
- Apps that still average Science into the Composite
The bottom line
A free app is a pocket quiz, not a course. If it cannot match today's section lengths, it is vocabulary practice at best.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.